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I am pretty sure the answer would be a
Answer:
The magnitude of induced emf is 5.4 V
Explanation:
Given:
Magnetic field
T
Area of loop

Time take to reduce loop to zero
sec
To find induced emf we use faraday's law,
Induced emf is given by,

Here minus sign shows lenz law, for finding magnitude of emf we ignore it.
Where
Put the value of flux and find induced emf,


V
Therefore, the magnitude of induced emf is 5.4 V
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